package cn.tedu.jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Scanner;

/**
 * 注销用户功能:JDBC执行DML语句[DELETE]
 * 请输入用户名: Tony
 * 返回结果: 注销成功 | 注销失败;
 * DELETE FROM userinfo WHERE username=''
 */
public class JDBCDemo3 {
    public static void main(String[] args) throws ClassNotFoundException, SQLException {
        Class.forName("com.mysql.cj.jdbc.Driver");
        Connection connection = DriverManager.getConnection(
                "jdbc:mysql://localhost:3306/tedu?characterEncoding=utf8&useSSL=false&serverTimezone=Asia/Shanghai&rewriteBatchedStatements=true",
                "root",
                "root"
        );
        //Statement执行对象:以字符串拼接方式执行SQL
        Statement statement = connection.createStatement();
        //用户输入
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入用户名:");
        String username = scanner.nextLine();
        //SQL:字符串拼接方式执行SQL
        String sql = "DELETE FROM userinfo WHERE username='"+username+"'";
        //i:受影响的数据条数
        int i = statement.executeUpdate(sql);
        if (i > 0){
            System.out.println("注销成功");
        }else {
            System.out.println("注销失败");
        }
        //断开连接
        connection.close();
    }
}









